1. The document discusses social cost benefit analysis (SCBA), which evaluates projects based on their overall impact on society rather than just their private costs and benefits. SCBA considers factors like externalities, taxes/subsidies, impact on savings, income distribution, and social goals. 2. The UNIDO approach to SCBA involves 5 stages - calculating financial profitability at market prices, determining net benefit using shadow prices, adjusting for impact on savings/investment and income distribution, and accounting for external social values. Shadow prices reflect social value and are based on factors like border prices, production costs, and willingness to pay. 3. SCBA is important for evaluating both public and private investments, as it

1. Social Cost Benefit Analysis
For example:
• Suppose, a manufacturer produces cigarettes and sell it Rs.40 a packet and another manufacturer produces soaps
and sell it Rs.20 a bar.
Now, if we think about the impact of soaps & cigarettes on the society, the questions may be –
▫ Does the price of cigarettes take account of the smokers’ higher probability of heart disease or cancer?
▫ Does the price of soap take note of the benefits from the use of soap, e.g., reduced risk of spread diseases?
Obviously, a commercial entrepreneur can’t give well answer to these questions.
What is Social Cost Benefit Analysis?
• So, to reflect the real value of a project to society, we must consider the impact of the project on society.
Impact
Positive Negative
(Social Benefit) (Social Cost)‫‏‬
Thus, when we evaluate a project from the view point of the society (or economy) as a whole, it is called Social Cost Benefit
Analysis (SCBA)/Economic Analysis.
Scope of SCBA
• SCBA can be applied to both Public & private investments –
▫ Public Investment:
SCBA is important especially for the developing countries where govt. plays a significant role in the economic
development.
▫ Private Investment:
Here, SCBA is also important as the private investments are to be approved by various governmental & quasi-
governmental agencies.
Objectives of SCBA
The main focus of Social Cost Benefit Analysis is to determine:
1. Economic benefits of the project in terms of shadow prices;
2 The impact of the project on the level of savings and investments in the society;
3. The impact of the project on the distribution of income in the society;
4. The contribution of the project towards the fulfillment of certain merit wants (self- sufficiency, employment etc).

2. Significances of SCBA
• SCBA has been emerged with some interesting significances. These significances also make the SCBA different from
the CBA.
 Market Imperfections
 Externalities
 Taxes & Subsidies
 Concern for Savings
 Concern for Redistribution
 Merit Wants
• Market Imperfections:
Market prices, the basis for CBA, do not reflect the social values under imperfect market competition.
• Externalities:
A project may have beneficial or harmful external effects that are considered in SCBA, not in CBA.
• Taxes & Subsidies:
From the social point of view, taxes & subsidies are nothing but transfer payments. But in CBA, taxes & subsidies are treated
as monetary costs and benefits respectively.
 Concern for Savings:
In SCBA, the division between benefits & consumption is relevant wherein higher valuation is placed on savings. But in CBA
such division is irrelevant.
 Concern for Redistribution:
In SCBA, the distribution of benefits is very much concerning issue where commercial private firm does not bother about it.
 Merit Wants:
Merit wants are important from the social point of view and therefore, SCBA considers these wants Approaches to SCBA
• There are two principal approaches for Social Cost Benefit Analysis.
A. UNIDO Approach, and
B. L-M Approach.
A. UNIDO Approach:
This approach is mainly based on the publication of UNIDO (United Nation Industrial Development Organization)‫‏‬
named Guide
to Practical Project Appraisal in 1978.

3. B. L-M Approach:
I.M.D Little & J.A.Mirlees have developed this approach for analysis of Social Cost-Benefit in Manual of Industrial Project
Analysis in Developing Countries and Project Appraisal & Planning for Developing Countries.
UNIDO Approach
The UNIDO approach of Social Cost Benefit Analysis involves five stages:
• Calculation of financial profitability of the project measured at market prices.
• Obtaining the net benefit of the project at shadow (efficiency) prices. (Objective of SCBA-1)‫‏‬
• Adjustment for the impact of the project on Savings & Investment. (Objective of SCBA-2)‫‏‬
• Adjustment for the impact of the project on Income Distribution. (Objective of SCBA-3)‫‏‬
• Adjustment for the impact of the project on Merit and Demerit Goods whose social values differ from their economic
values. (Objective of SCBA-4)‫‏‬
Stage-1: Calculation of financial profitability of the project
 A good technical and financial analysis must be done before a meaningful economic (social) evaluation can be made
so as to determine financial profitability.
 Financial profitability is indicated by the Net Present Value (NPV) of the project, which is measured by taking into
account inputs (costs) and outputs (benefits) at market price.
 Net Present value of a Project is calculated as:
Here,
Vt = Value of outputs at market price at time t
Ct = Value of inputs at market price at time t
K = Discount Rate
T = Lifetime of the project
I0 = Initial cost at the start of the project.
The project is viewed as financially feasible if NPV > 0
Stage-2: Obtaining the net benefit of the project at economic (shadow) prices
 The Commercial Profitability analysis (calculated in stage - 1) would be sufficient only if the Project is operated in
perfect market. Because, only in a perfect market, market prices can reflect the social value.
 If the market is imperfect (most of the cases in reality), net benefit of the Project is determined by assigning shadow
prices to inputs and outputs.

4.  Therefore, developing shadow prices is very much vital.
 Shadow Prices reflect the real value of a resource (input or output) to society.
 Shadow Prices are also referred as economic prices, accounting prices, economic/accounting efficiency prices etc.
 Shadow Prices can be defined as the value of the contribution to the country’s basic socio-economic objectives made
by any marginal change in the availability of commodities (0utput) or factor of production (input).
 Example: A project of power station may increase the production of electricity which contributes to one of the socio-
economic objectives of the country.
General Principles of Shadow Pricing
Numeraire:
 A unit of account in which the values of inputs and outputs are to be expressed.
 Numeraire is determined at-
• Domestic currency (BDT) rather than border price.
• Present value rather than future value.
• Constant price rather than current price.
Tradability:
 Tradability refers to whether a good or service is tradable or non-tradable; if tradable whether is fully traded or non-
traded.
 A good/service is tradable in the absence of or within limited trade barriers.
 A tradable good/service is actually traded when-
• The import (export) supply is perfectly elastic over the relevant range of volume.
• All additional demand (production) must be made (consumed) by import (export) due to the full capacity in the
domestic industry (fulfillment of demand by domestic consumer).
• The import (CIF) price is less or the export (FOB) price is more than the domestic cost of production.
 A good/service is non-tradable; if
• its import (CIF) price is greater than its domestic cost of production, and/or
• its export (FOB) price is less than its domestic cost of production.
 A tradable good/service that is not actually traded is called non-traded.
Sources of Shadow Pricing:
 Depending on the impact of the project on national economy, there are three sources of shadow pricing:

5. Taxes:
• If the project augments domestic production, taxes should be excluded;
• If the project consumes existing fixed supply of non- traded inputs, tax should be included;
• For fully traded goods, tax should be ignored.
Consumer Willingness to Pay (CWP):
• What a consumer wants to spend for a product or service.
• The difference between CWP and actual payment is called consumer surplus.
Shadow Pricing of Resources
Tradable inputs & outputs:
 For a fully traded good, the shadow price is border price translated into the domestic currency at shadow foreign
exchange.
 Assuming that a project uses two indigenous equipments costing Rs. 5, 00,000. These equipments can be exported at
$10,000. The shadow foreign rate of $ 1.00 is equivalent to Rs. 68.
Therefore, shadow price of these equipments (inputs) are ($10,000 × Rs.68) = Rs. 6, 80,000.
Impact of the project on National
Economy
Sources of
Shadow
Pricing
From production of
output angle
From consumption of
input angle
Increase total
consumption in the
economy
Decrease
consumption in the
rest of the economy
Consumer’s
willingness to
pay
Decrease production
in other parts of the
economy
Increase production
within the economy
Cost of
production
Decrease imports or
increase exports
Increase imports or
decrease exports
Foreign
Exchange
Value (Border
Tradability Type of Goods Shadow Prices
Input Output
Traded Border Price
• Export Export decreased Export increased Value of Export (FOB)
• Import Import increased Import decreased Cost of Import (CIF)

6. Non-Tradable Inputs & Outputs:
 Assuming that for a project, one-half of the required input is collected from additional domestic production which
has a domestic cost of Rs. 2, 00,000 and the rest one-half is collected from diversion from other consumers who are
willing to pay Rs. 3, 00,000.
Therefore, the shadow price of the inputs will be:
(Cost of production + consumer’s willingness to pay)‫‏‬
= Rs. (2, 00,000 + 3, 00,000)‫‏‬
= Rs. 5, 00,000
 Assuming that a newly establishes power station having a total capacity of 100 million units of electricity, charges
tariff at Rs. 1 for per unit electricity consumption. The consumers of that particular area are willing to pay Rs. 1.20 for
per unit.
Therefore, the shadow price is
(Rs. 1.20 × 10 million) = Rs. 120 million, instead of Rs. 100 million.
Tradability Type of Goods Shadow Prices
Input Output
Non-Traded:
Production More from local
producers
Less by other local
producers
Cost of Production
Consumption Less to other local
users
More to local users Consumer’s willingness to
pay
Tradability Type of Goods Shadow Prices
Input Output
Non-Traded:
Production More from local
producers
Less by other
local producers
Cost of Production
Consumption Less to other local
users
More to local
users
Consumer’s willingness to
pay

7. Externalities:
 An externality is an external effect (either beneficial or harmful) causes from a project which is –
• not deliberately created by the project sponsors but is an incidental outcome.
• beyond the control of the persons who are benefited or affected by it.
• not traded in the market place
Example of External Effects:
 Near about 100,000 people had lost lands 5,680 acres due to the project of Jamuna Bridge.
 People may be affected by erosion and flood conditions brought about by changes to the river which result from the
construction activities of a bridge.
 Environmental pollution created by brick field.
 A project of planting trees for commercial purpose may give protection to the environment against the increasing
global warmth.
Shadow Pricing of Externalities:
Although valuation of external effects is difficult as they are often intangible in nature and there is no market price, shadow
pricing of externalities may be made indirect means such as:
 The harmful effect of the bridge may be measured by the consumer willingness to pay for the output of the people
which has been reduced due to the bridge.
 The cost of pollution may be estimated in terms of the loss of earnings as a result of damage to health caused by it.
 Labor:‫‏‬
Capital:
 Investment of capital in a project causes to happen two things:
i. Financial resources are converted into physical assets
Possible Impact Shadow Price (Social Cost) of Labor
1. Taking labor away
from other employments
Willingness to pay of other users for this
labor
2. Stimulating the
production of new
workers
• the value assigned by the worker
on the leisure that he has forego.
• the additional consumption of food
• the cost of transport
• negative impact on savings and
investments due to the increased
3. Importing workers Flighting of foreign currency equivalent
to the wages commanded by them along
with a premium on account of the

8. ii. Financial resources are withdrawn from national pool of savings. Thus alternative projects are foregone and there is an
opportunity cost of it.
 The shadow price of physical assets is calculated in the same manner in which inputs and outputs are calculated.
 The opportunity cost of capital (shadow price of capital) depends on the source from which the capital has
generated.
Obtaining Net Benefit of the Project at Shadow Prices
 Determining the shadow price of
 One-Shot Costs
 Annual costs
 Annual benefits
 Calculating Net-benefit of the project from social point of view by :
Here,
Vt = Shadow price of Benefit at time t
Ct = Shadow price of Operating Expenses at time t
K = Social Discount Rate
T = Lifetime of the project
I0 = Initial cost at the start of the project.
Obtaining Net benefit of the Project (An illustration)
The Government is considering a project which would supply water for irrigation, generate electricity and provide a measure
of protection against floods. The project is expected to have a 25 year life time.
Generation of Capital Opportunity Cost of Capital
Generation from additional
savings
Consumption rate of interest or social
discount rate (the price must be paid
to the saver to sacrifice present
consumption)
Generation from the denial
of capital to alternatives
projects
Investment rate of interest
(Investment rate of return that would
be earned from those alternative
projects)

9. The costs and benefits of the project are:
COSTS:
1. Power equipment costing Rs. 30 crore.
(Additional Information: This equipment can be exported at $ 4.5 million. The shadow price of per dollar is Rs. 70)
2. 30,000 tons of cement produced indigenously are used in the project at a cost of Rs. 6,000. (Additional Information:
However, one-half of the cement will come from additional domestic production which cost Rs. 5,000 per ton and one-half
come from diversion from other consumers who are willing to pay Rs.6, 500 for per ton.)‫‏‬
3. Other construction materials (sand, bricks, steel etc.) ‫‏‬
‫‏‬Cost 20 crore. (Additional Information: these materials comes from
additional production, production cost of which is 15 crore.)
4. Two million man days of unskilled labor for which the project committee decided to pay a daily wage of Rs. 100.
(Additional Information: The shadow price of unskilled labor is 80 Rs. Per day)
31.5 crore
30 crore
One-Shot
Indigenous
Power
Equipment
Social
Angle
(Shadow
Private
Angle
(Market
Nature
Cost Type
Cost Type Nature Private Angle
(Market
price)
Social Angle
(Shadow
Price)
Cement One-Shot 18 crore 17.25 crore
Cost Type Nature Private
Angle
(Market
Social
Angle
(Shadow
Other
Materials
One-Shot 20 crore 15 crore

10. 5. Skilled labor costing Rs. 5 crore. (However, this cost reflects what others are willing to pay for the skilled labor)‫‏‬
6. Operating & Maintenance cost of the project will be Rs. 7.5 crore annually. (However, the operating cost should be Rs. 6.5
crore from social view point)
Benefits:
1. 0.5 million acres of land will be irrigated. The Government will charge the water levy at Rs. 150 for per acre.
(Additional Information: The value of additional output per acre due to the irrigation will be Rs. 500 per acre).
2. 100 million units of electricity will be generated for domestic use. The electricity tariff will be charged at Rs. 1 per
unit. (Additional Information: The consumers are willing to pay Rs. 1.5 for per unit of electricity).
16 core
20 crore
One-Shot
Unskilled Labor
Social Angle
(Shadow
Price)
Private Angle
(Market price)
Nature
Cost Type
5 crore
5 crore
One-Shot
Skilled
labor
Social
Angle
(Shadow
Price)
Private
Angle
(Market
price)
Nature
Cost Type
6.5 crore
7.5 crore
Annual
Operating
Cost
Social
Angle
Private
Angle
Nature
Cost Type
Benefit Type Nature Private Angle
(Market
price)
Social Angle
(Shadow
Price)
Irrigation Annual 7.5 crore 25 crore
Benefit
Type
Nature Private
Angle
(Market
Social
Angle
(Shadow
Electricity Annual 10 crore 15 crore

11. 3. Flood damages can be saved by Rs. 2 crore annually. However, the Government will not able to collect anything for
this.
Cost & Benefit of the Project (at a glance)‫‏‬
One-Shot cost:
Annual cost:
Benefit
Type
Nature Private
Angle
(Market
Social
Angle
(Shadow
Flood Relief Annual - 2 crore
Cost Type Private Angle
(Market price)
Social Angle
(Shadow Price)
Power Equipment 30 crore 31.5 crore
Cement 18 17.25
Other Materials 20 15
Unskilled Labor 20 16
Skilled Labor 5 5
Total 93 Crore 84.75 Crore
Cost Type Private Angle
(Market price)
Social Angle
(Shadow Price)
Operating Cost 7.5crore 6.5 crore
Total 7.5Crore 6.5 Crore

12. Annual Benefit:
Determining Project Profitability from the Private Angle
• Net Present value of a Project is calculated as:
Here,
Vt = Annual Benefit at time t = 17.5 crore
Ct = Annual cost at time t = 7.5 crore
K = Discount Rate = 10% (assuming)‫‏‬
T = Lifetime of the project = 25 years
I0 = Initial cost at the start of the project = 93 crore
Therefore,
= {10 (PVAF.10%, 25) – 93}
= {10 X 9.0770 – 93}
= Rs.( 2.23) crore
Therefore, the project is generating a negative NPV of Rs. 2.23 crore from the private angle.
Determining Project Profitability from the Social Angle
Net Present value of a Project from Social angle is calculated as:
Benefit Type Private Angle
(Market price)
Social Angle
(Shadow Price)
Irrigation 7.5 crore 25 crore
Electricity 10 crore 15 crore
Flood Relief - 2 crore
Total 17.5 Crore 42 Crore

13. Here,
Vt = Shadow price of Benefit at time t = 42 crore
Ct = Shadow price of Operating Expenses at time t = 6.5 crore
K = Social Discount Rate = 10% (assuming)‫‏‬
T = Lifetime of the project = 25 years
I0 = Initial cost at the start of the project = 84.75 crore
Therefore,
= {35.5 (PVAF.10%, 25) – 84.75}
= {35.5 X 9.0770 – 84.75}
= {322.23 – 84.75}
= Rs. 237.48 crore
From the view point of society, the project is generating a positive NPV of Rs. 237.48 crore.
Stage – 3: Adjustment for the impact of the project on Savings & Investment
 The purposes of this stage are to –
 determine the amount of income gained or lost because of the project by different income groups (such as project
other than business, government, workers, customers etc.)‫‏‬
 evaluate the net impact of these gains and losses on savings
 measure the adjustment factor for savings and thus the adjusted values for savings impact.
 adjust the impact on savings to the net present value calculated in stage two.
 Measurement of Gain or Loss:
A project appoints 1,000 laborers at a wage rate of Rs. 150 per day. These workers were ready to work for a daily
wage of Rs. 100.
Therefore, the gain of the group of 1,000 workers from the project is {(150 - 100) × 1,000} = Rs. 50,000 per day.
 Evaluation of the Net Impact on Savings:
Net Savings Impact of a project =
Here , Δ Yi = change in income of group i as a result of the project
MPSi = marginal propensity to save of group i
Assuming that the income gained or lost by 4 groups is:
Worker (W) =Rs. 2, 50,000, Consumer (C) = Rs. -7,00,000

14. Project (P) =Rs. 10, 00,000, External Sector (E) =Rs.5, 00,000
The marginal propensity to save of these four groups is:
MPSW = 0.04, MPSC= 0.25, MPSP = 0.4 & MPSE =0.3
Therefore, the net impact of the project on savings is:
{2, 50,000×0.04+ (-7, 00,000) ×0.25+10, 00,000×0.4 + 5, 00,000×0.3}
= 1, 00,000 – 1, 75,000 + 4, 00,000 + 1, 50,000
=Rs. 4, 75,000
 Adjustment Factor for Savings (AFs):
AFs measures the percentage by which the social value of investment of one taka exceeds social value of
consumption one taka.
Here,
MPC = Marginal Propensity to Consume
MPS = Marginal Propensity to Saving
MP Cap
= Marginal Productivity of Capital
CRI = Consumption Rate of Interest (social discount rate)‫‏‬
 Assuming that MPC, MPS, MPcap
& CRI of an economy is given:
MPC = 70%, MPS = 30%, MPcap
= 25% and CRI = 10%
Therefore, adjustment factor for saving is:
 Adjusted value of the impact of the project on savings:
Adjusted value of saving = (Net impact on savings × AFs)‫‏‬
= Rs. 4,75,000 × 6
= Rs. 28,50,000.
• This Rs. 28,50,000 is now added to the net present value of the project calculated in stage -2 ( Rs. 237.48 crore)‫‏‬
• Therefore, the adjusted net present value at this stage will be Rs. ( 237.48 + .285) = Rs.237.765 crore.

15. Stage – 4: Adjustment for the impact of the project on Income Distribution
 Government considers a project as an investment for the redistribution of income in favor of economically weakens
sections or economically backward regions.
 This stage provides a value on the effects of a project on income distribution between rich & poor and among
regions.
 Distribution Adjustment Factor (Weight) is calculated and the impacts of the project on income distribution have
been valued by multiplying the adjustment factor with the particular income of a group. This value will then be added
to the net present value re-calculated in stage three to produce the social net present value of the project.
Determination of Weights:
 It there are only two groups in a society, poor and rich, the determination of weight is just an iterative process
between the analysts (at the bottom) and the planners (at the top). This is called “bottom-up” approach.
 When more than two groups are involved, weights are calculated by the elasticity of marginal utility of income. The
marginal utility of income is the weight attached to an income is:
Where, wi = weight of income at ci level
ci = level of income of group i
b = base level of income that has a weight of 1.00 n = elasticity of the marginal utility of income
 Assuming that the worker group gains an income of Rs. 2,50,000 from a project, the base level of income is Rs. 50,000
which has a weight if 1.00 and elasticity of marginal utility of income is 0.20.
Therefore, weight is:
 So, value of the impact of the project on income distribution to this group is:
(Rs. 2,50,000 × 0.72) = Rs. 1,80,000.
 Now, this value will be added to the net present value adjusted in stage three.
 Therefore, Adjusted NPV in this stage will be
Rs. (237.765+ 0.018) = Rs. 237.78 crore
Stage – 5: Adjustment for Merit and Demerit Goods
 If there is no difference between the economic value of inputs and outputs and the social value of those, the UNIDO
approach for project evaluation ends at stage four.

16.  In practical, there are some goods (merit goods), social value of which exceed the economic value (e.g. oil, creation
of employment etc.) and also there are some goods (demerits goods), social value of which is less than their
economic value (e.g., cigarette, alcohol, high-grade cosmetics etc.)‫‏‬
 Adjustment to the net present value of stage 4 is required if there is any difference between the social and economic
value.
 The steps of adjustment procedure are:
• Estimating the present economic value
• Calculating the adjustment factor
 Multiplying the economic value by the adjustment factor to obtain the adjusted value
 Adding or subtracting the adjusted value to or from the net present value of the project as calculated in stage
four
An alcohol factory is under construction. The present economic value of the project is Rs. 237.78 crore
(Adjusted NPV up to stage 4). The output of the project has no social value than its cost of production. Cost
of production is the 60 percent of the economic price.
Therefore, adjustment factor is:
So, the adjusted value = (Rs. 237.78 crore × - 0.40)‫‏‬
= - Rs. 95.11 crore
Therefore, the net present value of the project in terms of socially acceptable consumption is
Rs.(237.78-95.11) = Rs. 142.67 crore.